REFERENCES

1
Results The event yields obtained are summarized
in Table 1. The QCD background estimation is
summarized in Table 2. Both ABCD and
extrapolation fit give consistent results. The
fit of the M3'(c2) distribution with data-driven
templates is shown in Figure 4. The systematic
uncertainty has been evaluated and summarized in
Table 3.
Background Estimation Two data-driven techniques
are adopted to estimate the amount of multi-jet
QCD background the ABCD method, which takes
advantage of the discrimination power in the
phase space of two independent variables
(d0/sd0BS and RelIso of the muon are used in
this study), and an extrapolation fit of the
relative isolation of the muon from the QCD
dominated region to the signal region as shown in
Figure 2.
Table 2 Summary of the QCD estimation for the
ABCD and extrapolation methods.
REFERENCES 1 M. Cacciari et. al., Updated
predictions for the total production cross
sections of top and of heavier quark pairs at the
Tevatron and at the LHC, JHEP 09(2008)127.